Encontrados 72 documentos, a visualizar página 1 de 8
Taxonomic resolution and Biological Traits Analysis (BTA) approaches in estuari...
Alves, A. S.; Verissimo, H.; Costa, M. J.; Marques, J. C.The taxonomic and functional structure of the subtidal nematode assemblages from a temperate estuary (Mondego estuary, Portugal) was studied, focussing on different taxonomic levels (genus, family and order), on single functional groups and on multiple biological traits. Based on taxonomic levels and on four biological traits (feeding type, life strategy, tail and body shape), the analysis of the nematode assem...
Systematic processes of land use/land cover change to identify relevant driving...
Teixeira, Zara; Teixeira, Heliana; Marques, J. C.Land use and land cover (LULC) are driving forces that potentially exert pressures on water bodies, which are most commonly quantified by simply obtained aggregated data. However, this is insufficient to detect the drivers that arise from the landscape change itself. To achieve this objective one must distinguish between random and systematic transitions and identify the transitions that show strong signals of ...
Biophysical probing of Spartina maritima photo-system II changes during prolong...
Duarte, B.; Santos, B.; Marques, J. C.; Caçador, I.Submergence is one of the major constrains affecting wetland plants, with inevitable impacts on their physiology and productivity. Global warming as a driving force of sea level rise, tend to increase the submersion periods duration. Photosynthesis biophysical probing arise as an important tool to understand the energetics underlying plant feedback to these constrains. As in previous studies with Spartina marit...
Structure, growth and production of a remarkably abundant population of the com...
Souza, A. T.; Dias, E.; Campos, J.; Marques, J. C.; Martins, I.The common goby, Pomatoschistus microps, is a relevant species from estuarine food webs, playing important roles as predator of polychaetes and crustaceans and as prey for larger fishes and crustaceans. The Minho estuary (NW Portugal) is a relatively wellpreserved and productive system. To assess the population structure and production of P. microps in this estuary, monthly samples were undertaken in three diff...
Temporal changes in macrofauna as response indicator to potential human pressur...
Bessa, Filipa; Gonçalves, Sílvia C.; Franco, João N.; André, José N.; Cunha, Pedro P.; Marques, J. C.Sandy beaches are natural dynamic ecosystems, which are becoming worldwide increasingly disturbed by intensive human direct use, coastal development and erosive evolution. In this study, we have examined whether ten years of potential increased human pressures have resulted in significant changes in the macrofaunal assemblages’ structure and composition of two mesotidal sandy beaches (Cabedelo – urban beach, an...
Benthic meiofauna as indicator of ecological changes in estuarine ecosystems: T...
Alves, Ana Sofia; Adão, Helena; Ferrero, T.; Marques, J.C.; Costa, M. J.; Patricio, J.Estuarine meiofauna communities have been only recently considered to be good indicators of ecological quality, exhibiting several advantages over macrofauna, such as their small size, high abundance, rapid generation times and absence of a planktonic phase. In estuaries we must account not only for a great natural variability along the estuarine gradient (e.g. sediment type and dynamics, oxygen availability, t...
Benthic meiofauna as indicator of ecological changes in estuarine ecosystems: T...
Alves, Ana; Adão, Helena; Ferrero, T.J; Marques, J.C; Costa, Maria Jose; Patricio, J.a b s t r a c t Estuarine meiofauna communities have been only recently considered to be good indicators of ecological quality, exhibiting several advantages over macrofauna, such as their small size, high abundance, rapid generation times and absence of a planktonic phase. In estuaries we must account not only for a great natural variability along the estuarine gradient (e.g. sediment type and dynamics, oxygen...
Marine research in the Iberian Peninsula: A pledge for better times after an ec...
Borja, Angel; Marques, J. C.; Olabarria, Celia; Quintino, VictorThe “17th Iberian Symposiumof Marine Biology Studies” took place in San Sebastian (Spain), in September 2012. This contribution is an introduction to a special issue collating the most challenging papers submitted by Portuguese and Spanish scientists to the symposium. The text was structured as a novel, with the three main parts of a novel: (i) Setup: a historical context, from old times to the 1970's. This par...
Polar marine biology science in Portugal and Spain: Recent advances and future ...
Xavier, José C.; Barbosa, Andrés; Agustí, Susana; Alonso-Sáez, Laura; Alvito, Pedro; Ameneiro, Julia; Ávila, Conxita; Baeta, Alexandra; Canário, JoãoPolar marine ecosystems have global ecological and economic importance because of their unique biodiversity and their major role in climate processes and commercial fisheries, among others. Portugal and Spain have been highly active in a wide range of disciplines in marine biology of the Antarctic and the Arctic. The main aim of this paper is to provide a synopsis of some of the results and initiatives undertak...
Good Environmental Status of marine ecosystems: What is it and how do we know w...
Borja, Angel; Elliott, Mike; Andersen, Jesper H.; Cardoso, Ana C.; Carstensen, Jacob; Ferreira, João G.; Heiskanen, Anna-Stiina; Marques, J. C.The European Marine Strategy Framework Directive (MSFD) requires EU Member States (MS) to achieve Good Environmental Status (GEnS) of their seas by 2020. We address the question of what GEnS entails especially with regard to the level at which targets are set (descriptors, criteria, indicators), to scales for assessments (regional, sub-divisions, site-specific), and to difficulties in putting into practice the ...
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